Friday, 3 June 2016

Re: OpenGL to OpenGL ES change on arm64?

On Fri, Jun 3, 2016 at 2:51 PM, Steve Langasek
<[email protected]> wrote:
> On Fri, Jun 03, 2016 at 01:03:53PM -0600, Dann Frazier wrote:
>> [ Reorganized to use inline replies ]
>> On Fri, Jun 3, 2016 at 12:49 PM, Kevin Gunn <[email protected]> wrote:
>> > On Fri, Jun 3, 2016 at 10:47 AM, Matthias Klose <[email protected]u.com> wrote:
>
>> >> LP: #1586026 asks for the removal of binary packages on arm64 which
>> >> cannot be built with OpenGL ES. Do we really have to cripple an
>> >> architecture like this? I don't see any discussion about this. How
>> >> does this affect things like GPU accelerators and CUDA aware packages?
>
>> > hey Matthias,
>> > after reading the bug, it's implied the binaries being asked for removal
>> > were somehow built with gl (possibly sw implementation of gl?)....please
>> > cmiiaw
>
>> > as to the request, never say never, but at least i've never seen an arm
>> > chipset in the wild with a gl enabled gpu (like the bug indicates they're
>> > all gles).
>> > so i'm not sure of the value of having those binaries present where at least
>> > in real application, there's no gl ?
>
>> Ubuntu supports a growing number of ARM servers that have PCIe slots,
>> so external GPUs can be added. CUDA is supported on those platforms
>> upstream:
>> https://developer.nvidia.com/cuda-toolkit-65
>> And I do know there are users interested in CUDA on Ubuntu/arm64.
>
>> I'm not experienced with CUDA myself - and don't have a card to test it - but
>> it would be good to know if we're breaking that use case ahead of time.
>
> I agree that CUDA should be a concern on arm64. However, this bug report is
> about changes to the Qt GL stack on arm64. Qt is a GUI toolkit; I don't see
> any reason that building Qt for GLES instead of GL should impact CUDA, do
> you?

If this change goes no deeper than the Qt stack, then no.

> And while ARM64 servers have PCIe slots and can take GPUs, I don't expect
> this to mean that we want to support a desktop stack in such a
> configuration.

I don't know of any such use cases.

-dann

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